My ex-wife had an abortion and my(our) two daughters don’t know and I’m not sure if I will ever tell them. I know my ex won’t. I really wrestle with that. Perhaps, when they’re older(15 and almost 13 now), I will ask their mom to share it with them.
So who is living with the guilt, you or your ex-wife? Evidently it's not her........
The answer is so simple............
As a post script, having given it more thought, I would highly recommend you tell your daughters of their mother's previous abortion. To them, abortion is just a word that is not given any thought to at their age.
By informing them that a brother or sister had been murdered before the child was even born my have a postive effect on their lives in regard to the sanctity of life for all and especially the unborn.........
And if she says "no," then leave it be.
Think really carefully about how it would touch their lives to know that. Would it make them better? Encourage them? I don’t know what I would do. First thought is it’s kind of like a spouse telling about her affair and asking for forgiveness, which is almost too much to ask of your children.